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CS1613-FSZR LED Driver IC Equivalent & Substitute Parts
Part Overview
The CS1613-FSZR is an AC DC offline switcher LED driver IC manufactured by Cirrus Logic Inc., designed for lighting applications with Triac dimming capability. This part operates across a 11V to 17V supply range and features a Step-Down (Buck) and Step-Up (Boost) topology in a 16-SOIC package. The CS1613-FSZR is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements.
Substiute Parts
Key Parameters
| Parameter | CS1613-FSZR |
|---|---|
| Manufacturer | Cirrus Logic Inc. |
| Category | Power Management (PMIC) |
| Type | AC DC Offline Switcher |
| Topology | Step-Down (Buck), Step-Up (Boost) |
| Number of Outputs | 1 |
| Voltage - Supply (Min) | 11V |
| Voltage - Supply (Max) | 17V |
| Dimming | Triac |
| Package / Case | 16-SOIC (0.154", 3.90mm Width) |
| Operating Temperature | -40°C ~ 125°C (TJ) |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution for the CS1613-FSZR is determined by the following critical parameters: AC DC offline switcher topology, single output configuration, Triac dimming capability, operating temperature range (-40°C to 125°C), and supply voltage compatibility within the 11V to 17V range. Package form factor and internal switch configuration are secondary considerations that may require PCB layout modifications.
The substitute parts are grouped into two categories based on topology alignment:
Category 1: Buck Topology (Preferred for Direct Substitution)
- LM3445MX/NOPB (Texas Instruments): Buck topology, active product status, supply range 8V–12V
- LYT1402D-TL (Power Integrations): Buck topology, active product status, integrated internal switch, supply range 90VAC–308VAC
Category 2: Flyback Topology (Alternative Substitution)
- MP4030AGS, MP4030GS, MP4031GS-Z (Monolithic Power Systems Inc.): Flyback topology, active product status, supply range 11V–27V, smaller 8-SOIC package
Category 3: Buck/Boost Topology (Functional Equivalent)
- TPS92075DR/NOPB (Texas Instruments): Buck/Boost topology, active product status, supply range 11V–18V, 8-SOIC package
Parameter Comparison
| Parameter | CS1613-FSZR | LM3445MX/NOPB | LYT1402D-TL | MP4030GS | MP4031GS-Z | TPS92075DR/NOPB |
|---|---|---|---|---|---|---|
| Manufacturer | Cirrus Logic Inc. | Texas Instruments | Power Integrations | Monolithic Power Systems Inc. | Monolithic Power Systems | Texas Instruments |
| Type | AC DC Offline Switcher | AC DC Offline Switcher | AC DC Offline Switcher | AC DC Offline Switcher | AC DC Offline Switcher | AC DC Offline Switcher |
| Topology | Step-Down (Buck), Step-Up (Boost) | Step-Down (Buck) | Step-Down (Buck) | Flyback | Flyback | Step-Down (Buck), Step-Up (Boost) |
| Number of Outputs | 1 | 1 | 1 | 1 | 1 | 1 |
| Voltage - Supply (Min) | 11V | 8V | 90VAC | 11V | 11V | 11V |
| Voltage - Supply (Max) | 17V | 12V | 308VAC | 27V | 27V | 18V |
| Dimming | Triac | Triac | — | Triac | Analog, TRIAC | Triac |
| Operating Temperature | -40°C ~ 125°C (TJ) | -40°C ~ 125°C (TJ) | -40°C ~ 125°C (TJ) | -40°C ~ 125°C (TJ) | -40°C ~ 125°C (TJ) | -40°C ~ 125°C (TJ) |
| Package / Case | 16-SOIC | 14-SOIC | — | 8-SOIC | 8-SOIC | 8-SOIC |
| Product Status | Obsolete | Active | Active | Active | Active | Active |
| RoHS Status | — | ROHS3 Compliant | RoHS Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 3 (168 Hours) | 1 (Unlimited) | 1 (Unlimited) | 2 (1 Year) | 2 (1 Year) | 1 (Unlimited) |
Engineering Selection Recommendations
Primary Recommendation: LM3445MX/NOPB The LM3445MX/NOPB from Texas Instruments is the preferred substitute for the CS1613-FSZR. Both devices share Buck topology, single-output configuration, Triac dimming capability, and identical operating temperature range. The LM3445MX/NOPB is active in production with ROHS3 compliance and MSL 1 rating, providing superior moisture handling compared to the obsolete CS1613-FSZR. The supply voltage range (8V–12V) overlaps the CS1613-FSZR range (11V–17V) within the 11V–12V window, making it suitable for designs operating in this band. Package reduction from 16-SOIC to 14-SOIC requires PCB layout modification.
Secondary Recommendation: TPS92075DR/NOPB The TPS92075DR/NOPB from Texas Instruments provides functional equivalence with Buck/Boost topology matching the CS1613-FSZR. Supply voltage range (11V–18V) encompasses the full CS1613-FSZR range (11V–17V). This device is active with ROHS3 compliance and MSL 1 rating. The 8-SOIC package requires significant PCB redesign but offers the most compact footprint among substitutes.
Tertiary Recommendation: MP4031GS-Z The MP4031GS-Z from Monolithic Power Systems Inc. offers Flyback topology with dual dimming capability (Analog and TRIAC). Supply voltage range (11V–27V) fully encompasses the CS1613-FSZR range. This device is active with ROHS3 compliance and MSL 2 rating. The 8-SOIC package and Flyback topology require circuit redesign but provide extended supply voltage headroom.
Alternative: LYT1402D-TL The LYT1402D-TL from Power Integrations features integrated internal switching and Buck topology. This device operates across 90VAC–308VAC input range, suitable for direct AC mains applications. It is active with RoHS compliance and MSL 1 rating. This substitute is appropriate only for designs requiring direct AC input without intermediate DC conversion.
Frequently Asked Questions (FAQ)
Q: Can I directly replace CS1613-FSZR with LM3445MX/NOPB without PCB modifications? A: No. While both devices share Buck topology and Triac dimming, the package changes from 16-SOIC to 14-SOIC. Pin-to-pin compatibility must be verified against detailed datasheets. PCB layout modifications are required.
Q: What is the key difference between Buck and Flyback topologies in these substitutes? A: Buck topology (LM3445MX/NOPB, LYT1402D-TL) steps down voltage directly and is suitable for lower voltage applications. Flyback topology (MP4030GS, MP4031GS-Z) uses transformer isolation and is suitable for applications requiring galvanic isolation or wider voltage ranges. Circuit design differs significantly between topologies.
Q: Why does LYT1402D-TL have a different supply voltage range (90VAC–308VAC)? A: The LYT1402D-TL is designed for direct AC mains input with integrated rectification and switching. The CS1613-FSZR operates on DC supply (11V–17V). These devices serve different input architectures and are not interchangeable without system redesign.
Q: Which substitute has the best moisture sensitivity rating? A: LM3445MX/NOPB and TPS92075DR/NOPB both have MSL 1 (Unlimited), providing superior moisture protection compared to the CS1613-FSZR (MSL 3, 168 Hours) and MP4031GS-Z (MSL 2, 1 Year).
Q: Are all substitutes RoHS compliant? A: Yes. LM3445MX/NOPB, MP4030GS, MP4031GS-Z, and TPS92075DR/NOPB are ROHS3 compliant. LYT1402D-TL is RoHS compliant. All substitutes meet current environmental regulations.
Q: What is the smallest package option among substitutes? A: MP4030GS, MP4031GS-Z, and TPS92075DR/NOPB all use 8-SOIC packages, compared to the CS1613-FSZR 16-SOIC. This reduces PCB footprint but requires significant circuit redesign.
Q: Can I use MP4030GS and MP4031GS-Z interchangeably? A: Both devices share identical supply voltage range (11V–27V), Flyback topology, 8-SOIC package, and operating temperature. MP4031GS-Z adds Analog dimming capability in addition to TRIAC. Verify dimming requirements against application specifications before selection.
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